US5094784A - Dual volume carburetor priming system - Google Patents

Dual volume carburetor priming system Download PDF

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Publication number
US5094784A
US5094784A US07/654,346 US65434691A US5094784A US 5094784 A US5094784 A US 5094784A US 65434691 A US65434691 A US 65434691A US 5094784 A US5094784 A US 5094784A
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United States
Prior art keywords
bulb
volume
fluid
depression
extent
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US07/654,346
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English (en)
Inventor
Stephen D. Ditter
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Tecumseh Products Co
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Tecumseh Products Co
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Publication date
Application filed by Tecumseh Products Co filed Critical Tecumseh Products Co
Priority to US07/654,346 priority Critical patent/US5094784A/en
Assigned to TECUMSEH PRODUCTS COMPANY, A CORP OF MI reassignment TECUMSEH PRODUCTS COMPANY, A CORP OF MI ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DITTER, STEPHEN D.
Priority to ITTO920108A priority patent/IT1256864B/it
Priority to CA002061123A priority patent/CA2061123C/en
Application granted granted Critical
Publication of US5094784A publication Critical patent/US5094784A/en
Assigned to JPMORGAN CHASE BANK, N.A. reassignment JPMORGAN CHASE BANK, N.A. SECURITY AGREEMENT Assignors: TECUMSEH PRODUCTS COMPANY
Assigned to CITICORP USA, INC. reassignment CITICORP USA, INC. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CONVERGENT TECHNOLOGIES INTERNATIONAL, INC., EUROMOTOT, INC., EVERGY, INC., FASCO INDUSTRIES, INC., HAYTON PROPERTY COMPANY LLC, LITTLE GIANT PUMP COMPANY, M.P. PUMPS, INC., MANUFACTURING DATA SYSTEMS, INC., TECUMSEH CANADA HOLDING COMPANY, TECUMSEH COMPRESSOR COMPANY, TECUMSEH DO BRASIL USA, LLC, TECUMSEH POWER COMPANY, TECUMSEH PRODUCTS COMPANY, TECUMSEH PUMP COMPANY, TECUMSEH TRADING COMPANY, VON WEISE GEAR COMPANY
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/02—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F02M1/16—Other means for enriching fuel-air mixture during starting; Priming cups; using different fuels for starting and normal operation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/08—Carburetor primers

Definitions

  • the present invention relates generally to carburetors for internal combustion engines, and more specifically to carburetor primer mechanisms especially for use in diaphragm-type carburetors.
  • Known priming arrangements are frequently in the form of an operator actuable bulb which, when depressed, displaces a volume of air into the air space above a carburetor float bowl fuel well. This air exerts a pressure on the fuel which forces the fuel upwardly through a conduit into a venturi where it is mixed with air and then drawn into the intake manifold of the engine.
  • the present invention provides a priming system that permits displacement of a normal volume of fluid and, alternatively, a high volume of fluid for priming a fuel system that has been run dry of fuel.
  • the primer includes a flexible bulb, wherein the volume of fluid displaced is dependent upon the extent of manual depression of the bulb. Two different volumes of fluid may be displaced by the bulb depending upon the manner of actuation of the bulb.
  • the invention provides a primer for a carburetor system of an internal combustion engine in which a flexible bulb is actuated in a first manner to permit displacement of a greater volume of fluid than actuation of the bulb in a second manner. More specifically, the present invention provides a primer having a manually depressible bulb and a stop member located within the bulb for limiting depression of the bulb to a first extent in response to actuation of the bulb in a first manner and to a second extent in response to actuation of the bulb in a second manner.
  • One advantage of the primer of the present invention is that different volumes of fluid may be displaced by the primer depending upon the manner of actuation of the bulb, thereby providing the desired displacement volume under various starting conditions.
  • Another advantage of the primer of the present invention is that a large volume of fluid displacement is available for cold start enrichment of an engine that is run dry of fuel.
  • a further advantage of the primer of the present invention is that limiter posts are located within the primer bulb to limit the extent of depression of the bulb, thus providing a predetermined amount of fuel to enter the carburetor and reducing the potential for overenrichment and engine flooding.
  • the present invention in one form thereof, provides a carburetor system for an internal combustion engine.
  • the system includes a primer having a flexible bulb which when manually depressed, displaces a volume of fluid.
  • the volume of fluid is dependent upon the extent of manual depression of the bulb.
  • Stop means such as limiter posts are located within the bulb for limiting depression of the bulb to a first extent in response to actuation of the bulb in a first manner and to a second extent in response to actuation of the bulb in a second manner.
  • the present invention in one form thereof, provides a carburetor system for an internal combustion engine.
  • the system includes a carburetor having a throat formed therein which defines a fuel/air mixture passage therethrough.
  • the system further includes a fuel supply bowl and a conduit for conveying fuel from the fuel supply bowl to the throat.
  • a priming chamber and a priming passage providing communication between the priming chamber and the carburetor.
  • the primer includes a flexible bulb which, when manually depressed, displaces fluid from the priming chamber through the priming passage and into the throat of the carburetor. The volume of fluid displaced is dependent upon the extent of manual depression of the bulb.
  • Limiter posts are located within the bulb for limiting depression of the bulb to a first extent in response to actuation at a first location on the bulb and to a second extent in response to actuation at a second location on the bulb.
  • FIG. 1 is a side elevational view of an internal combustion engine, including a primer in accordance with the present invention
  • FIG. 2 is an enlarged perspective view of the primer of FIG. 1;
  • FIG. 3 is an enlarged cross-sectional view of the primer of FIG. 2, taken along line 3--3 in FIG. 2;
  • FIG. 4 is a longitudinal sectional view of the primer of FIG. 3, taken along line 4--4 in FIG. 3;
  • FIG. 5 is an enlarged bottom view of the primer of FIG. 2;
  • FIG. 6 is a perspective view of the primer according to the present invention, wherein the primer bulb has been depressed by an operator to generate a high volume priming;
  • FIG. 7 is the primer of FIG. 6, wherein the primer bulb has been depressed by an operator to generate normal volume priming.
  • a small internal combustion engine 10 including a conventional carburetor 12. Liquid fuel is supplied from fuel supply bowl 14 to carburetor 12 through conduit 16. The air-vaporized fuel mixture from carburetor 12 then passes into the intake manifold of the engine.
  • the priming system includes a primer 18 for forcing fuel and/or air through tubing 20 and into the carburetor bowl, and then into either the fuel nozzle chamber or the diaphragm chamber in carburetor 12 to force fuel into the throat of carburetor 12.
  • primer 18 includes a circular mounting portion 22 integrally formed with a downwardly extending nipple 24.
  • Mounting portion 22 includes a generally circular lower base portion 26 and a concentric raised base portion 28.
  • a plurality of limiter posts 30 are circumferentially secured to raised portion 28.
  • a much smaller limiter post 32 is also secured to raised portion 28.
  • FIG. 3 illustrates one possible arrangement of limiter posts 30 and 32 around raised portion 28 in which each post is disposed approximately 90° apart.
  • flexible squeeze bulb 34 includes a flanged portion 36 that is secured within mounting portion 22 by a retaining ring 38.
  • Bulb 34 is generally hollow and is made from a polymer material that is not affected by petrochemical products.
  • Retaining ring 38 includes a plurality of radially extending locking tangs 40 which are canted, as shown in FIG. 4, to permit insertion of ring 38 into mounting portion 22, but to restrict subsequent upward movement of ring 38 thereby securing ring 38 within mounting portion 22.
  • Nipple 24 of primer 18 is secured to flexible tube 20 and includes an axial fluid passage 42 therein for communicating air and/or fuel from interior space 43 of bulb 34, through opening 44 (FIG. 3), into passage 42, and then into tube 20.
  • the bottom surface of mounting portion 22 includes an orientation tab 48 to properly orient primer 18 on engine 10.
  • primer 18 can provide either a high volume prime or a normal volume prime.
  • High volume prime is the volume of priming necessary to sufficiently prime a fuel system that has been run dry of fuel.
  • the volume of the prime is dependent upon the manner in which bulb 34 is actuated and is determined by the spacing and height of posts 30 and 32.
  • a normal volume of prime is solely determined by the height of posts 30.
  • normal volume priming is achieved upon depression of the top of bulb 34 until the bulb engages limiter posts 30.
  • the volume of air and/or fuel displaced is forced through tubing 20 and into carburetor 12, thereby forcing a predetermined amount of fuel into the throat of carburetor 12.
  • the volume of normal priming can be varied by varying the height of posts 30.
  • primer 18 also provides high volume priming for purging a fuel system which has been run dry of fuel or is new.
  • bulb 34 is actuated as shown in FIG. 6.
  • High volume priming can be accomplished by the use of limiter post 32, which is smaller than limiter posts 30 thereby allowing a larger displacement of bulb 34.
  • the location of post 32 within bulb 34 is externally indicated by a small orientation notch 50 on mounting portion 22.
  • notch 50 When bulb 34 is depressed on the side indicated by notch 50, a relatively large volume of air and/or fuel is displaced since bulb 34 can be depressed a greater distance before being stopped by posts 30 and 32 due to the short height of post 32.
  • FIG. 6 illustrates the thumb of the operator depressing bulb 34 in this manner.
  • the top of bulb 34 is also depressed in the same manner as described for normal volume priming. It is the simultaneous depression of bulb 34 at both the top and the side indicated by notch 50 that provides the high volume priming.
  • the high volume prime provides fluid displacement up to 2.7 times that of normal volume priming.
  • a single circumferential post having a recessed shoulder may be provided so that actuation of the bulb at the shoulder permits the bulb to be displaced a distance sufficient for high volume priming.
  • any other shape or size of bulb limiting device may be used within bulb 34 which supplies a gap or space to allow greater displacement of the bulb when actuated at such location than if actuated at a second location.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
  • Means For Warming Up And Starting Carburetors (AREA)
US07/654,346 1991-02-12 1991-02-12 Dual volume carburetor priming system Expired - Lifetime US5094784A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US07/654,346 US5094784A (en) 1991-02-12 1991-02-12 Dual volume carburetor priming system
ITTO920108A IT1256864B (it) 1991-02-12 1992-02-11 Sistema di innesco a due volumi per carburatore
CA002061123A CA2061123C (en) 1991-02-12 1992-02-12 Dual volume carburetor priming system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/654,346 US5094784A (en) 1991-02-12 1991-02-12 Dual volume carburetor priming system

Publications (1)

Publication Number Publication Date
US5094784A true US5094784A (en) 1992-03-10

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Family Applications (1)

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US07/654,346 Expired - Lifetime US5094784A (en) 1991-02-12 1991-02-12 Dual volume carburetor priming system

Country Status (3)

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US (1) US5094784A (it)
CA (1) CA2061123C (it)
IT (1) IT1256864B (it)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080135018A1 (en) * 2006-12-06 2008-06-12 Husqvarna Outdoor Products Inc. Multi-chambered fuel enrichment device
US20090056662A1 (en) * 2007-09-04 2009-03-05 Vogt Nathan R Externally Vented Carburetor System with Vapor Containment

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2470288A (en) * 1944-04-24 1949-05-17 Bendix Aviat Corp Excess pressure protected pressure responsive device
US3275305A (en) * 1965-05-03 1966-09-27 Tillotson Mfg Co Fuel feed and charge forming apparatus with priming device
US3494343A (en) * 1968-03-15 1970-02-10 Tillotson Mfg Co Priming device for internal combustion engines
US3529908A (en) * 1968-10-07 1970-09-22 Gorman Rupp Co Variable output positive displacement bellows pump
US4006329A (en) * 1975-05-14 1977-02-01 Westport Development & Mfg. Co. Inc. Switch for sensing a selected ratio between two different pressures
DD131869A5 (de) * 1977-05-21 1978-07-26 Lucas Industries Ltd Fluessigkeitsverdraengungsvorrichtung
US4197825A (en) * 1977-11-25 1980-04-15 Tecumseh Products Company Primer bulb retainer
GB2056568A (en) * 1979-07-25 1981-03-18 Outboard Marine Corp Fuel primer and enrichment system for an internal combustion engine
JPS5954758A (ja) * 1982-09-24 1984-03-29 Shinagawa Diecast Kogyo Kk 気化器の始動燃料供給装置
US4589386A (en) * 1985-04-04 1986-05-20 Inertia Dynamics Corp. Carburetor priming system for internal combustion engines
US4655690A (en) * 1983-07-21 1987-04-07 Lang Apparatebau Gmbh Bellows pump having adjustable stop cam for varying the stroke
US4684484A (en) * 1986-05-27 1987-08-04 Tecumseh Products Company Primer system and method for priming an internal combustion engine
US4926808A (en) * 1989-06-08 1990-05-22 Tecumseh Products Company Primer bulb check valve system for an internally vented bowl primer carburetor

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2470288A (en) * 1944-04-24 1949-05-17 Bendix Aviat Corp Excess pressure protected pressure responsive device
US3275305A (en) * 1965-05-03 1966-09-27 Tillotson Mfg Co Fuel feed and charge forming apparatus with priming device
US3494343A (en) * 1968-03-15 1970-02-10 Tillotson Mfg Co Priming device for internal combustion engines
US3529908A (en) * 1968-10-07 1970-09-22 Gorman Rupp Co Variable output positive displacement bellows pump
US4006329A (en) * 1975-05-14 1977-02-01 Westport Development & Mfg. Co. Inc. Switch for sensing a selected ratio between two different pressures
DD131869A5 (de) * 1977-05-21 1978-07-26 Lucas Industries Ltd Fluessigkeitsverdraengungsvorrichtung
US4197825A (en) * 1977-11-25 1980-04-15 Tecumseh Products Company Primer bulb retainer
GB2056568A (en) * 1979-07-25 1981-03-18 Outboard Marine Corp Fuel primer and enrichment system for an internal combustion engine
JPS5954758A (ja) * 1982-09-24 1984-03-29 Shinagawa Diecast Kogyo Kk 気化器の始動燃料供給装置
US4655690A (en) * 1983-07-21 1987-04-07 Lang Apparatebau Gmbh Bellows pump having adjustable stop cam for varying the stroke
US4589386A (en) * 1985-04-04 1986-05-20 Inertia Dynamics Corp. Carburetor priming system for internal combustion engines
US4684484A (en) * 1986-05-27 1987-08-04 Tecumseh Products Company Primer system and method for priming an internal combustion engine
US4926808A (en) * 1989-06-08 1990-05-22 Tecumseh Products Company Primer bulb check valve system for an internally vented bowl primer carburetor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080135018A1 (en) * 2006-12-06 2008-06-12 Husqvarna Outdoor Products Inc. Multi-chambered fuel enrichment device
US7546825B2 (en) 2006-12-06 2009-06-16 Husqvarna Outdoor Products Inc. Multi-chambered fuel enrichment device
US20090056662A1 (en) * 2007-09-04 2009-03-05 Vogt Nathan R Externally Vented Carburetor System with Vapor Containment

Also Published As

Publication number Publication date
CA2061123C (en) 1996-09-03
ITTO920108A0 (it) 1992-02-11
CA2061123A1 (en) 1992-08-13
ITTO920108A1 (it) 1993-08-11
IT1256864B (it) 1995-12-27

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Effective date: 20060206